WO2000059102A1 - Circuit de commande a modulation d'impulsions en largeur pour consommateur electrique - Google Patents

Circuit de commande a modulation d'impulsions en largeur pour consommateur electrique Download PDF

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Publication number
WO2000059102A1
WO2000059102A1 PCT/EP2000/004276 EP0004276W WO0059102A1 WO 2000059102 A1 WO2000059102 A1 WO 2000059102A1 EP 0004276 W EP0004276 W EP 0004276W WO 0059102 A1 WO0059102 A1 WO 0059102A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
consumer
switching means
capacitor
circuit arrangement
Prior art date
Application number
PCT/EP2000/004276
Other languages
German (de)
English (en)
Inventor
Olaf Huckfeldt
Original Assignee
Leopold Kostal Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19914654A external-priority patent/DE19914654A1/de
Application filed by Leopold Kostal Gmbh & Co. Kg filed Critical Leopold Kostal Gmbh & Co. Kg
Priority to AU45651/00A priority Critical patent/AU4565100A/en
Publication of WO2000059102A1 publication Critical patent/WO2000059102A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation

Definitions

  • Circuit arrangement for pulse-width-modulated control of an electrical consumer
  • the invention relates to a circuit arrangement for pulse-width-modulated control of an electrical consumer, comprising a circuit part with a switching means for clocked connection and disconnection of the consumer with or from the operating voltage source, with a capacitor connected in parallel with the switching means, used as a buffer capacitance, and with an electrical coil .
  • Such a circuit arrangement is used to control an electric motor used, for example, as a window regulator drive.
  • Such a circuit arrangement is usually designed to work against ground and can therefore be referred to as a current regulator.
  • There are other areas of application for such a circuit arrangement namely those which are against the Voltage source are trained working and can be addressed as a voltage or switching regulator.
  • a switching means that can be controlled in a clocked manner - for example a transistor - is connected in series with the consumer, via which switching means a connection of the electric motor to the operating voltage source or a disconnection from it takes place in accordance with the intended clock rate.
  • a power consumption by the consumer which, depending on its type, may be an ohmic or an inductive one
  • Resistance component is marked, is essentially limited to those time intervals in which the circuit between the voltage source, the consumer, the switching means and the ground is closed.
  • the current profile resulting from such a circuit arrangement is rectangular, as is shown schematically in the attached FIG. 7.
  • a capacitor representing a buffer capacitance and a diode arranged in parallel with the consumer are provided in a circuit part. If the switching means is open in this circuit arrangement, the consumer is in a closed circuit due to its parallel arrangement to the diode.
  • the parallel to the consumer and the switching means Arranged buffer capacity serves to collect the EMF resulting from the self-inductances.
  • the invention is therefore based on the object of developing an initially mentioned circuit arrangement for pulse-width-modulated control of an electrical consumer such that not only the described antenna effect of the circuit arrangement is suppressed, but also an implementation of the circuit arrangement by means of small-sized electronic components is possible.
  • circuit part consisting of the switching means and the parallel capacitor is connected in series with the consumer and the coil and that the capacitance of the capacitor and the clock rate of the switching means are matched to one another, so that a voltage supply to the consumer is maintained regardless of the position of the switching means.
  • circuit part containing the buffer capacitance is connected in parallel with the switching means and this subcircuit is connected in series with the consumer. This ensures that even in those time intervals in which the switching means is open and thus the consumer of the
  • the subcircuit can thus also be addressed as an energy storage circuit. Since the circuit is closed via the buffer capacitance even when the switching means is open, the consumer is supplied with a voltage until the capacitance of the capacitor is filled. However, in order to prevent the current flow from being interrupted by the charged capacitor, the capacitance of the capacitor and the timing of the switching means are matched to one another in such a way that the switching means is switched on again before the capacitor is full. When the switching means is switched on again, the circuit is closed again via the switching means, so that the capacitor is also discharged via the switching means in this switch position. By ensuring a closed circuit in each switch position, this circuit arrangement with its connecting lines to the voltage source does not act as an antenna due to the continuous current profile. Since no self-inductances have to be absorbed, the electronic components used can be correspondingly small.
  • the circuit arrangement according to the invention is suitable both for use in a mass working as well as in a against Voltage source working arrangement.
  • the circuit arrangement is used as a current regulator.
  • This arrangement is preferably used, for example, to control electric motors, for example as a window regulator drive in a motor vehicle.
  • the inductive resistance component of the electric motor can be used as the coil required in the circuit arrangement, so that this inductive component can be used in cooperation with the capacitor to smooth the current profile. In such a case, there is no need to use an otherwise necessary smoothing coil.
  • a transistor is expediently used as the switching means, a coil being integrated in the circuit part to protect the transistor when the capacitor is discharged.
  • this coil can be connected upstream of the capacitor and thus be located in the switching branch parallel to the switching means. Provision can also be made to arrange the coil in series with the switching means, in which case the coil is assigned a freewheeling diode connected in parallel.
  • Fig. 1 a schematic diagram of a working against ground
  • Fig. 2 a schematic diagram of a working against ground
  • FIGS. 1 to 4 a schematic diagram illustrating the current profile during operation of one of the circuit arrangements according to FIGS. 1 to 4,
  • FIG. 6 the behavior of the capacitor used in the circuit arrangement according to FIG. 1 as a function of the activation of the switching means
  • FIG. 7 a representation of the current profile of a previously known, for
  • a circuit arrangement 1 working against ground is used for pulse-width-modulated control of an electric motor 2 used as a consumer.
  • the electric motor 2 is connected to a changeover relay 3, so that the electric motor 2 can be operated both in one and in the other direction of rotation.
  • the relay 3 is connected to a connecting line 4, which establishes an electrical connection to the operating voltage source, namely a battery.
  • the motor-relay unit is identified overall by the reference number 5.
  • a circuit part 6 designed as an energy storage circuit is connected to the motor relay unit 5 and essentially consists of a transistor T used as switching means and a capacitor C serving as a buffer capacitance.
  • the capacitor C is connected in parallel to the transistor T.
  • the transistor T 1 is connected to a control circuit 7, via which the switching frequency and the pulse width are provided.
  • a measuring resistor R 1 is switched on to the transistor T.
  • a coil L and a free-wheeling diode D 1 connected in parallel with the coil L are arranged in series in front of the transistor T.
  • the coil L serves in particular to protect the transistor T when the capacitor C is discharged.
  • the motor relay unit 5 is integrated into a circuit. This circuit is maintained until the buffer capacitance of the capacitor C is filled.
  • the switching means T 1 is brought into its closed state before the buffer capacitance of the capacitor C, is exhausted. This means that the electric motor 2 continues to run slightly even when the switching means is open.
  • the circuit described above is then restored, the capacitor C discharging to the ground when the switching means T is closed via the circuit branch of the switching means T 1 .
  • the coil L in particular, serves to protect the switching means used as transistor T 1 .
  • FIG. 2 shows a further exemplary embodiment of a circuit arrangement 8 for pulse-width-modulated control of an electric motor 9, which essentially corresponds to the circuit arrangement 1.
  • Capacitor C 2 has a coil L 2 switched in series with capacitor C 2 to form an oscillating circuit. In the circuit branch of the
  • transistor T 2 needs one coil and one
  • Free-wheeling diode not to be provided.
  • FIGS. 3 and 4 show two further circuit arrangements 10, 11 which, in contrast to circuit arrangements 1 and 8 in FIGS. 1 and 2, work against the voltage source.
  • the circuit arrangements 10, 11 can therefore be referred to as voltage regulators.
  • the circuit arrangements 10, 11 are each provided as a consumer, which only has an ohmic resistance component. For this reason, the consumer is identified by the reference symbol R v .
  • the circuit parts 6 of the circuit arrangements 10, 11 each comprise a control circuit 12, 13 for controlling a transistor T 3 , T 4 used as switching means.
  • a capacitor C 3 , C 4 for bridging the switching means T 3 , T 4 is connected in parallel with the switching means T 3 , T 4 .
  • a coil L 4 and a free-wheeling diode D 3 connected in parallel with the coil I_ 4 are arranged in series with the capacitor C 4 in the circuit arrangement 10 .
  • a coil L 3 is switched on as a protective measure in the subcircuit of the capacitor C 3 .
  • the circuit part 6 of the circuit arrangements 10, 11 is followed by an LC filter formed from a coil L 5 or L 6 and a capacitor C 5 or C 6 , the consumer R v being parallel to the respective capacitor C 5 or C 6 is switched.
  • circuit arrangements 10, 11 corresponds to that of the circuit arrangements 1 and 8, so that reference is made to the above statements in this regard.
  • FIG. 7 The continuous current profile which results when one of the circuit arrangements 1, 8, 10 or 11 is in operation is shown schematically and in simplified form in FIG. 7 the current profile of a circuit arrangement belonging to the prior art with the typically rectangular profile. This current consumption, which is incomplete in the prior art, is responsible for the emitted electromagnetic wave.
  • the charging and discharging of the capacitor C is shown schematically in FIG. 6, the charge state of the capacitor C being shown by the term “current”.
  • the control voltage of the transistor T is also shown schematically, with that in the circuit arrangement shown 1 transistor T used is switched on when the voltage is greater than 10 V. It is provided to set the switching frequency at 20 kHz.
  • To dimension the capacitor C it is provided that the time constant resulting from the motor coil and the capacitor C. - Compared to the time that the switching means consisting of the transistor T 1 is switched off - is large, a corresponding curve could be shown for the charge states of the capacitors C 2 to C 4 of the further circuit arrangements 8, 10, 11.
  • the circuit arrangements 10 and 11 is used to determine the time constant to be taken into account instead of the motor coil of the El Electric motor 2 or 9 to consider the coil L 5 or L 6 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

L'invention concerne un circuit de commande à modulation d'impulsions en largeur destiné à un consommateur électrique. Le circuit comprend un élément circuit comportant un élément de commutation qui permet de connecter et de déconnecter de manière cadencée ledit consommateur par rapport à la source de tension de fonctionnement; un condensateur monté en parallèle avec l'élément de commutation et se présentant sous forme de capacité tampon; et une bobine électrique. Le circuit est caractérisé par le fait que l'élément circuit, constitué de l'élément de commutation et du condensateur monté en parallèle, est monté en série avec le consommateur et la bobine. La capacité du condensateur et la cadence de l'élément de commutation sont mutuellement synchronisées, de façon que l'alimentation en tension de fonctionnement du consommateur reste indépendante de la position de l'élément de commutation.
PCT/EP2000/004276 1999-03-31 2000-03-23 Circuit de commande a modulation d'impulsions en largeur pour consommateur electrique WO2000059102A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU45651/00A AU4565100A (en) 1999-03-31 2000-03-23 Circuit for the pulse width-modulated control of an electrical consumer

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19914654A DE19914654A1 (de) 1999-03-31 1999-03-31 Schaltungsanordnung zum pulsweitenmodulierten Ansteuern eines elektrischen Verbrauchers
DE19914654.3 1999-03-31
DE29910731.0 1999-06-19
DE29910731U DE29910731U1 (de) 1999-03-31 1999-06-19 Schaltungsanordnung zum pulsweitenmodulierten Ansteuern eines elektrischen Verbrauchers

Publications (1)

Publication Number Publication Date
WO2000059102A1 true WO2000059102A1 (fr) 2000-10-05

Family

ID=26052692

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/004276 WO2000059102A1 (fr) 1999-03-31 2000-03-23 Circuit de commande a modulation d'impulsions en largeur pour consommateur electrique

Country Status (2)

Country Link
AU (1) AU4565100A (fr)
WO (1) WO2000059102A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195713A1 (fr) * 1985-03-15 1986-09-24 Thomson-Csf Dispositif d'aide à la commutation d'interrupteur et de diode de roue libre
US4720668A (en) * 1986-06-20 1988-01-19 Lee Fred C Zero-voltage switching quasi-resonant converters
EP0865059A1 (fr) * 1997-03-13 1998-09-16 Electrowatt Technology Innovation AG Circuit pour un fonctionnement économique en énergie d'un relais

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195713A1 (fr) * 1985-03-15 1986-09-24 Thomson-Csf Dispositif d'aide à la commutation d'interrupteur et de diode de roue libre
US4720668A (en) * 1986-06-20 1988-01-19 Lee Fred C Zero-voltage switching quasi-resonant converters
EP0865059A1 (fr) * 1997-03-13 1998-09-16 Electrowatt Technology Innovation AG Circuit pour un fonctionnement économique en énergie d'un relais

Also Published As

Publication number Publication date
AU4565100A (en) 2000-10-16

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